This set of Instrumentation Transducers Multiple Choice Questions & Answers (MCQs) focuses on “Electro Mechanical Transducers”.
1. Which of the following can be measured using tachometers?
a) Angular speed
b) Linear speed
c) Acceleration
d) Vibration
View Answer
Explanation: Tachometers are special devices used to measure angular displacement of rotating shafts.
2. Two phase induction motor can be used as AC tachometers.
a) True
b) False
View Answer
Explanation: One phase of the induction motor can be used to provide reference supply and the second phase can be used for providing output voltage related to speed.
3. Electrodynamic vibration transducers are based on _____________
a) Magnetostriction
b) Electromagnetic induction
c) Self inductance
d) None of the mentioned
View Answer
Explanation: Electrodynamic vibration transducers are based on electromagnetic induction, in which magnet induces emf in a coil.
4. Which of the following is used for measuring emf between plates of transducers?
a) Low impedance voltmeter
b) High impedance voltmeter
c) Any voltmeter
d) None of the mentioned
View Answer
Explanation: High impedance voltmeters are used for eliminating the effect of drop due to the internal resistance of liquid measured.
5. Which of the following is applicable for the electromagnetic flow meter?
a) It causes obstruction to flow
b) It doesn’t cause obstruction t flow
c) It cannot be used in slurries
d) None of the mentioned
View Answer
Explanation: Electromagnetic flow meters don’t cause obstruction to flow and can be used for measurement in slurries.
6. Which of the following quantities are sensitive to electromechanical flow meters?
a) Viscosity
b) Density
c) Temperature
d) None of the mentioned
View Answer
Explanation: Electromagnetic flow meters are insensitive to quantities like viscosity, density, and temperature of liquid etc.
7. Which of the following represents the expression of output from electromechanical flow meter?
a) BDV
b) BV
c) BD
d) BD2V
View Answer
Explanation: Output potential of electromechanical transducer will be equal to the product of magnetic flux density, diameter of pipe, and velocity of flow.
8. Electromechanical system can be used for measuring vibration.
a) True
b) False
View Answer
Explanation: Electromechanical system can be used for measuring vibration, in which vibratory motion will be converted to an output voltage.
9. Which of the following is correct for AC and DC tachometers?
a) Sensitivity if AC tachometer is very high
b) Sensitivity of DC tachometer is very high
c) Sensitivity of both are equal
d) None of the mentioned
View Answer
Explanation: For AC tachometer it has a sensitivity which is very less than the sensitivity of DC tachometers.
10. Which of the following is correct for the tachometer system?
a) First order system
b) Second order system
c) Third order system
d) Unpredictable
View Answer
Explanation: Tachometer systems are second order systems.
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